<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>

        <!-- 表格 -->
        <tree-table
          class="treeTable"
          :data="catelist"
          :columns="columns"
          :selection-type="false"
          :expand-type="false"
          show-index
          index-text="#"
          border
          :show-row-hover="false"
        >
          <!-- 是否有效 -->
          <template slot="isok" slot-scope="scope">
            <i
              class="el-icon-success"
              v-if="scope.row.cat_deleted === false"
              style="color: lightgreen"
            ></i>
            <i class="el-icon-error" v-else style="color: red"></i>
          </template>
          <!-- 排序 -->
          <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
            <el-tag type="warning" size="mini" v-else>三级</el-tag>
          </template>
          <!-- 操作 -->
          <template slot="opt" slot-scope="scope">
            <el-button
              type="primary"
              icon="el-icon-edit"
              size="mini"
              @click="showEditCateDialog(scope.row.cat_id)"
            >编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          </template>
        </tree-table>

        <!-- 分页区域 -->
        <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[3, 5, 10, 15]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total"
        ></el-pagination>
      </el-row>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <el-cascader
            v-model="selectdKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑分类的对话框 -->
    <el-dialog title="修改分类" :visible.sync="editCateDialogVisible" width="50%">
      <el-form
        ref="editCateFormRef"
        :rules="editCateFormRules"
        :model="editCateForm"
        label-width="80px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //商品分类的数据列表，默认为空
      catelist: [],
      //查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 10
      },
      //总数据条数
      total: 0,
      //为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          //表示将当前列定义为模板列
          type: "template",
          //表示当前这一列的模板名称
          template: "isok"
        },
        {
          label: "排序",
          //表示将当前列定义为模板列
          type: "template",
          //表示当前这一列的模板名称
          template: "order"
        },
        {
          label: "操作",
          //表示将当前列定义为模板列
          type: "template",
          //表示当前这一列的模板名称
          template: "opt"
        }
      ],
      //控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        //将要添加分类的名称
        cat_name: "",
        //父级分类的id
        cat_pid: 0,
        //分类的等级默认1级分类
        cat_level: 0
      },
      //添加分类表单的验证规则
      addCateFormRules: {
        cate_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      },
      //父级分类的列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        expandTrigger: "hover",
        checkStrictly: true,
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      //选中的父级分类的ID数组
      selectdKeys: [],
      editCateForm: {
        cat_name: ""
      },
      //控制修改分类对话框的显示与隐藏
      editCateDialogVisible: false,
      //   修改分类的验证规则
      editCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //监听pagesize改变的事件
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    //监听pagenum改变的事件
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败!");
      }
      //把数据列表赋值给catelist
      this.catelist = res.data.result;
      this.total = res.data.total;
    },
    //点击按钮，展示添加分类的对话框
    showAddCateDialog() {
      //先获取父级分类的数据列表
      this.getParentCateList();
      //展示出对话框
      this.addCateDialogVisible = true;
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 }
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败!");
      }
      this.parentCateList = res.data;
    },
    //选择项变化触发这个函数
    parentCateChange() {
      //如果 selectdKeys 数组中的 length 大于0，证明选中的父级分类
      //反之，就说明没有选中任何父级分类
      if (this.selectdKeys.length > 0) {
        //父级分类的Id
        this.addCateForm.cat_pid = this.selectdKeys[
          this.selectdKeys.length - 1
        ];
        //为当前分类的等级赋值
        this.addCateForm.cat_level = this.selectdKeys.length;
        return;
      } else {
        this.addCateForm.cat_pid = 0;
        this.addCateForm.cat_level = 0;
      }
    },
    //点击按钮，添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败!");
        }
        this.$message.success("添加分类成功!");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    //监听对话框的关闭时间，重置表单数据s
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectdKeys = [];
      this.addCateForm.cat_pid = 0;
      this.addCateForm.cat_level = 0;
    },
    //展示编辑分类的对话框
    async showEditCateDialog(id) {
      const { data: res } = await this.$http.get("categories/" + id);
      if (res.meta.status !== 200) {
        return this.$message.error("查询分类数据失败!");
      }
      this.editCateForm = res.data;
      this.editCateDialogVisible = true;
    },
    //点击按钮，修改分类
    editCate() {
    //   this.$refs.editCateFormRef.validate(async valid => {
    //     if (!valid) return;
    //     const { data: res } = this.$http.put(
    //       "categories/",
    //       this.editCateForm.cat_id,
    //       {
    //         cat_name: this.editCateForm.cat_name
    //       }
    //     );
    //     console.log(res)
    //     if (res.meta.status !== 200) {
    //       return this.$message.error("更新分类失败!");
    //     }
    //     //关闭对话框
    //     this.editCateDialogVisible = false;
    //     //刷新数据列表
    //     this.getCateList();
    //     //提示修改成功
    //     this.$message.success("更新分类成功!");
    //   });
    }
  }
};
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 55px;
}
el-cascader {
  width: 100%;
}
</style>